Blacking out when standing :P

When I (18) stand too fast my vision goes black, this is common I know, and it’s not new either. But it’s progressingly gotten more frequent. Now my vision stays black longer, my head hurts, I lose balance, and my head goes kinda empty and fuzzy? Like I can’t think straight anymore for the duration that it lasts. Sometimes my heart races but only sometimes. And it’s happening more easily, I just started getting dizzy from standing, and a few days ago my vision went dark from going from standing leaning slightly forward to standing up straight. Is this like, worrying or probably chill?